Lesson 27
CCSS
L.3.4b: Determine the meaning of the new
word formed when a known affix is added
to a known word (e.g., agreeable/disagreeable,
comfortable/uncomfortable, care/careless,
heat/preheat).
Prefixes and Suffixes
Introduction Use your knowledge of word parts to figure out what new words mean.
• A prefix is a word part added to the beginning of a word. Adding a prefix changes
the meaning of a base word.
Prefix
dispreun-
Meaning
Example
“not” or “opposite of” dislike
“before”
prewash
“not” or “opposite of” untrue
Meaning
“to not like”
“to wash before”
“not true”
• A suffix is a word part added to the end of a word. Adding a suffix changes the
meaning of a base word.
Suffix
-able
-ful
-less
Meaning
“can be” or “able to”
“full of” or “having”
“without”
Example
trainable
skillful
useless
Meaning
“can be trained”
“having skill”
“without use”
• Some words have both a prefix and a suffix: uncomfortable, disagreeable.
Guided Practice Write the base word and the prefix or suffix that make up each
underlined word. Then tell a partner what the underlined word means.
1 Here are some ways to be helpful at home.
Hint
A prefix or a suffix
can have more
than one meaning.
Think about
which meaning
makes sense in
the sentence.
helpful = + base word
suffix
2 Try to be agreeable with your family.
agreeable = + base word
suffix
3 Never be dishonest.
dishonest = + prefix
base word
4 Try to share, and never be unfair.
unfair = + L27: Prefixes
L27: Prefixes
and Suffixes
and Suffixes
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prefix
base word
295
Common
Core
Practice
Common
Core
Practice
Lesson 27
For numbers 1–5, read each sentence. Then choose the correct
meaning of each underlined word.
1 Follow these useful safety tips.
A without use
Answer Form
1 A B C D
2 A B C D
3 A B C D
4 A B C D Number
5 A B C D Correct
5
B not used
C having use
D before using
4 Never unbuckle your seatbelt
while in a moving car.
A buckle before
B do the opposite of buckle
2 Don’t be careless when you carry
something hot.
C without a buckle
D full of buckles
A without care
B full of care
C able to care
D having care
5 You will find these safety tips are
easily doable.
A able to be done
B not done
3 Let adults preview movies you
want to see.
C having done
D mostly done
A not view
B view without you
C mostly view
D view before
296
L27: Prefixes and Suffixes
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Lesson 27
Lesson 27
Introduction
Lesson 27
1
Meaning
Example
“not” or “opposite of” dislike
“before”
prewash
“not” or “opposite of” untrue
Meaning
“can be” or “able to”
“full of” or “having”
“without”
A without use
Meaning
“to not like”
“to wash before”
“not true”
B
Example
trainable
skillful
useless
4
D before using
A prefix or a suffix
can have more
than one meaning.
Think about
which meaning
makes sense in
the sentence.
B
Meaning
“can be trained”
“having skill”
“without use”
2
B
D having care
not done
C having done
D mostly done
A not view
B
+
suffix
view without you
C mostly view
Never be dishonest.
D view before
+
prefix
base word
Try to share, and never be unfair.
unfair =
+
prefix
base word
L27: Prefixes
L27: Prefixes
and Suffixes
and Suffixes
©Curriculum Associates, LLC
You will find these safety tips are
easily doable.
B
Let adults preview movies you
want to see.
suffix
dishonest =
4
5
A able to be done
Try to be agreeable with your family.
base word
3
full of care
C able to care
3
agreeable =
D full of buckles
A without care
+
base word
2
do the opposite of buckle
C without a buckle
Don’t be careless when you carry
something hot.
Here are some ways to be helpful at home.
helpful =
Never unbuckle your seatbelt
while in a moving car.
A buckle before
Guided Practice Write the base word and the prefix or suffix that make up each
underlined word. Then tell a partner what the underlined word means.
1
Copying is not permitted.
295
296
L27: Prefixes and Suffixes
©Curriculum Associates, LLC
Lesson 27: Prefixes and Suffixes
Common Core Practice, page 296
Guided Practice, page 295
1 C
1 help + ful
2 A
helpful means “full of help”
2 agree + able
5
not used
C having use
• Some words have both a prefix and a suffix: uncomfortable, disagreeable.
Hint
1
2
3
4
5
Follow these useful safety tips.
• A suffix is a word part added to the end of a word. Adding a suffix changes the
meaning of a base word.
Suffix
-able
-ful
-less
Answer Form
A B C D
A B C D
A B C D
A B C D Number
A B C D Correct
For numbers 1–5, read each sentence. Then choose the correct
meaning of each underlined word.
Use your knowledge of word parts to figure out what new words mean.
• A prefix is a word part added to the beginning of a word. Adding a prefix changes
the meaning of a base word.
Prefix
dispreun-
Common
Core
Practice
Common
Core
Practice
CCSS
L.3.4b: Determine the meaning of the new
word formed when a known affix is added
to a known word (e.g., agreeable/disagreeable,
comfortable/uncomfortable, care/careless,
heat/preheat).
Prefixes and Suffixes
agreeable means “able to agree”
Copying is not permitted.
3 D
4 B
5 A
3 dis + honest
dishonest means “not honest” or “the opposite
of honest”
4 un + fair
unfair means “not fair” or “the opposite of fair”
248
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